Carbon removing tool



Sept. 1, 1931. w. 0. JONES CARBON REMQVING TOOL Filed May 9, 1950 IN VEN TOR. 7460. ,foizea BY I I" ATTORNEY.

Patented Sept. 1, 1931 UNITED STATES PATENT o1=1=1cs WILLIAM OSCAR JONES, F MARISSA, ILLINOIS, ASSIGNOR OF ONE-HALF TO HOMER W.

' PRESLY, OF SWANWICK, ILLINOIS GARIBON REMOVING TOOL Application filed May 9, 1930. Serial No. 451,177.

My invention relates to a carbon removing tool and more particularly to a tool for cleaning piston ring grooves of carbon accumulation.

The invention has for its object the provision of simple means for cleaning piston ring grooves to free them of carbon and other foreign deposits, and,,it is a distinct and practical improvement to overcome certain 10 practical objections to, and defects in, the

present forms of tools designed for like purposes. 1

Further objects of the invention-are first, the provision of a carbon removing tool having two members hinged together at one end and connected by means of a spring for pulling the free ends thereof toward each other; second, the provision of two double cutting edged scrapers carried by the free ends of the tool members and so arranged that the inner cutting edge of one scraper will be operative when the tool is revolved in one direction and the other scraper inoperative from a cleaning standpoint and vice-versa; third, to provide a guard member connected at opposite ends to the two hinged members for engagement with the piston for gauging the positions of the scrapers in a piston ring groove.

A further object of the invention is the provision of a carbon removing tool which possesses advantages in points of simplicity and efliciency, and at the same time proves itself comparatively inexpensive in cost of manufacture.

With the above and other objects in view, the invention consists in the novel features of construction, arrangement and combination of parts hereinafter more fully described and finally pointed out in the claims hereto appended.

Referring to the accompanying drawings forming a part of this specification, wherein like characters of reference denote similar parts throughout the several views:

Fig. 1 is a top plan view of a tool embodying the features of my invention, showing the same applied to a piston ring groove, the piston being shown in sectional elevation.

scraper head engaged ina ring groove of a piston.

The tool embodying the invention in the present lllustration which shows one good form thereof, comprisesthe members 1 and 2 pivotally connected, as at 3., at one end thereof. The free ends of the member 1 and 2 are slightlycurved toward each. other, as at 4 and the inner face of each curved section 4 of the arms 1 and 2, at the free ends thereof, is provided with a flat recess or cutaway portion 5 to provide a shoulder 6. The members 1 and 2 are connected by means'oi suit-able coiled spring 7 disposed between the me1nbers of a suitable point away from the piv- 0t 3. One end of the spring 7 is connected to the eye 8 of a pin 9 which is pr ferably split, such for instance as a cotter pin, although not necessarilylimited thereto as a solid pin may be employed, and .which pin passes through an opening in member 1 and M is clinched at its outer end, as 11.10. The other end of the spring 7 is connected to the eye 11 of a suitable pin 12 which passes throughan opening in member 2 and which is held injvarious adjusted positions to permit of a wider range ofspreading o the members 1 and 2 by means of aset screw 13 carried by member 2. This arrangement permits the tool to heapplied to pistons of V difierent diameters, within certain bounds of course, while at the same time affording means for always pullmg the members 1 and 2 toward each'otherby spring tension.

Each curved section 1 of the members 1 and 2 have anopening 151 to receive a screw threadedshank 15 provided with a nut 16 which engages the shoulder 6 and is seated in the flat recess 5. A thumb nut 17 is carried by eachscrew threaded shank 15 which enmember 20 is connected at opposite ends to the two screw threaded shanks 15 between the two nuts 17 and 19 which hold the guide members against rotary displacement upon the shanks 15. This flexible curved guide member 20 is adapted to engage side walls of a piston 21 to prevent the scraper heads from jumping out of the ring groove 22 when applied thereto for cleaning same free of carcon and foreign deposits.

Each scraper head 18 has a curved inner face and is provided at each end with a cutting edge, the cutting edge at one end being designated 28 and at the opposite end 24. The double cutting edges permit the scraper heads to be readily reversed in case that one edge thereof becomes dull without having to remove the scraper heads from the arms 1 and 2 for sharpening same until both cutting edges have become dull.

lVhen the device is applied to the ring grooves of a piston to be cleaned, it will be observed from Fig. 1, that the inner edges of the scraper heads engage the base of the ring groove just back of the greatest diameter thereof so that in rotating the tool the scraper heads will not jump out of the ring groove. t will be observed from Fig. 1, that when the device is rotated in direction of the arrow A, that the edge 23 of the right hand scraper head 18 will loosen or disintegrate the carbon in the groove 22 and that the edge 23 of the left hand scraper head 1.8 will merely follow up in the grooves and clear, or clean the disintegrated carbon therefrom, and that when the device is rotated in direction of the arrow B, a reverse action will take place.

The many advantages of the herein described invention will readily suggest themselves to those skilled in the art to which it appertains;

From the foregoing description, it is evident that a simple device for this purpose has been disclosed, but it is to be understood that I do not desire to restrict, or limit myself to the very details of the construction shown and described, which is merely illustrative, it being obvious that changes, not involving the exercise of invention, may be made without; conflicting or departing from the spirit of the invention within the scope of the appended claims.

What I claim is:

1. A device for removing carbon from piston ring grooves comprising, in combination, a pair of arms pivotally connected at one end thereof, a reversible double edged scraper member fixed to the free end of each arm and so disposed with relation to the groove that but one edge of one scraper at .a time will disintegrate carbon deposit in the groove when rotary movement is applied to the device, a curved guide member connecting the arms and engaging the side walls of the piston to which it is applied and resilient means connecting the arms for normally urging the free ends of the arms toward each other.

2. In a device of the class described, a pair of arms pivotally connected at one end thereof and each having an opening at the free end thereof, a pair of double edged carbon scrapingmembers adapted to he received by the ring groove of a piston with one edge of each scraping member in contact with the base of the ring groove, a screw threaded shank directed from each scraping member andadapted to pass through the openings in the free ends of said arms, means for holding the screw threaded shanks against rotary displacement and a curved resilient piston engaging member connected at its ends to said screw threaded shanks and a nutcarried by each shank. a

8. In a device of the class described, a pair of arms pivotally connected at one end thereof, resilient means for normally urging the free ends of said arms toward each other, a recess formed upon the inner face of each arm at the free ends thereof, a screw threaded shank passing through an opening at the free end. of each arm, a nut carried by each shank adapted to engage the recessed face of each arm, a. thumb nut for each shank adapted to engage the outer face of each arm to hold the shanks against rotary displacement, a curved resilient guide member connected at opposite ends to said shanks, a scraper member connected to the inner end of each shank and said scraper members hzwing each end thereof provided with a scraper edge so that the scraper members can be reversed when one of the scraper edges thereof becomes dull.

In testimony whereof I have hereunto affixed my signature.

WILLIAM OSCAR JONES. 

